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    <h2 align="center">HTML5&lt;Day01&gt;</h2>
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    <h3>1 HTML文档片段</h3>
    <h4>1.1问题</h4>
    <div>创建如图-1所示的HTML页面</div>
    <h3>1 HTML文档片段</h3>
    <h4>1.2方案</h4>
    <div>使用HTML完成效果</div>
    <h3>1 HTML文档片段</h3>
    <h4>1.3实现</h4>
    <div>创建index.html,完成操作</div>
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